646101400 has 96 divisors (see below), whose sum is σ = 1763324640. Its totient is φ = 215516160.

The previous prime is 646101397. The next prime is 646101427. The reversal of 646101400 is 4101646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45564 + ... + 58036.

It is an arithmetic number, because the mean of its divisors is an integer number (18367965).

Almost surely, 2^646101400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646101400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881662320).

646101400 is an abundant number, since it is smaller than the sum of its proper divisors (1117223240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646101400 is a wasteful number, since it uses less digits than its factorization.

646101400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12533 (or 12524 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 646101400 is about 25418.5247408263. The cubic root of 646101400 is about 864.5037749925.

The spelling of 646101400 in words is "six hundred forty-six million, one hundred one thousand, four hundred".